Expansion joint



o 19 9. A. Q'FISCHER 11,73

EXPANSION JoI'm" Filed. July 29, 1.92 6 I 2 Sheets-Sheet 1 Oct l, 1929 c.- FISCHER r 1,730,066

' EXPANSION Jb u'r Filed Ju1y 29, 1926 2 Sheets-Sheet 2 mll'- I :flll

Patented Oct. 1, 1929 UNITED, STATES PATENT OFFICE ALBERT C. FISCHER, OF CHICAGO, ILLINOIS, LASSIGNOR TO THE PHILIP CAREY MANU- 'FACTUBING COMPANY, A CORPORATION OF QHIO EXPANSION JOINT Application filed July 29,

- 5 ticular reference to that part of the specification of said application which describes 'an expansion joint constructed in multiple layers.

The primary object of the invention is to construct an expansion joint which will develop an intimate bond with the concrete sections between which it is installed, so as to i anchor, so to speak, the joint with the concrete to prevent displacement of the same without sacrificing compressibility and ex-- pansibility.

In the accompanying drawing which illustrates the preferred construction of the joint, Figure 1 is a perspective view of one form of joint made possibleby my invention;

Figure 1 is a perspective view of the imperforate layer of the joint;

Figure 1 is a perspective View of the perforate layer of the joint;

Figure 1 is a perspective of a modified form;

Figure 1 is a perspective view of the modification in Figure-1 with part of the perforated sheet broken away; I

Figure 2 is a perspective view of a modified form;

Figure 3 is a perspective view of still another form, and v Figure 4 is a cross section on the line 44 of Figure 1.

It is of course understood that the views show portions of a strip of expansion joint.

Referring to the drawings in detail, 5 represents an intermediate sheet of felt, paper or any other material suitable for the purpose, carrying on opposite sides thereof mastic layers 6 and 7. These layers are preferably developed from bituminous material, although a composition of matter may be used, or in fact any material which will produce a relatively soft mastic mass of an adhesive character.

:53 On opposite sides of the layers 6, and 7 are 1926. Serial No. 125,737.

paper or a composition of differenti tions the usual position would be to stand the joint on end and pour the concrete around it. The concrete in this respect entering the perforations and contacting with the mastic, so that .an intimate bond is eifected between the concrete and the joint, particularly between the concrete and the mastic part of the joint.

After the concrete sets the perforations developed will produce a multiplicity of buttons on the sides of the concrete, which in effect is an interlocking engagement with the joint. With this result I am able to say that the bond between the concrete and the joint is efi'ected by an interlocking engagement as well as by adhesion, since the concrete buttons will adhere to the mastic in the perfora-,' tions. As a modified form I may simply use two perforated sheets-8 and 9, with an intermediate layer of mastic 6. In this form the intermediate sheet 5 is not used.

As still another form I may use a-relatively thick layer 7 of mastic between two perforated sheets 8 and 9.

In some forms it may also be desirable to use a perforated sheet only on one side of the joint, with an unperforated sheet on an opposite side. This form is illustrated in Figures 1 and 1 in which asuitable joint is formed from imperforate sheet 5 and perforate sheet 9 being adhesively or otherwise attached.

It can be readily appreciated that where greater thicknesses in the joint are required additional layers may be built up by applying a mastic layer over the perforated sides, and additional perforated sheets over the added mastic layers, or else plain unperfo rated sheets may be applied to one side.. The idea being that, while the relative superimposed re ation of the sheets would ordinarily be arranged as shown, the arrangement may 'be changed and enlarged u on without departing from the spirit of t e invention, as pointed out "in the subjoined claims. How- 5 ever, in any arrangement one or both sides. of the joint'will be surfaced with a perforated sheet in which the mastic partly or completely fills the perforations, so as to bring it in direct contact with the concrete poured around the same. i

If desirable the mastic material of the intermediate layersmay be mixed with a flow retarder or a fibrous filling material. Inthe latter case disc like pieces cut out to make the perforations in the sheet 8 and 9 may be used as a filler, either whole or they may be subdivided. 1

Iclaimr v a 1. A multiple layer expansion 'oint, having one of its sides surfaced wit a perforated sheet, with mastic material exposed I thru said erforations. Q 2. Amu tiple layer expansion joint, having 1 one of its sides surfaced with a perforated sheet, superim sed upon a mastic layer, and with restricte areas of said mastic layer exposed thru said perforations.

3. Expansion'jointcomprising a strip sur- A faced with a perforated sheet, with mastic '30 material exposed thru perforations in said sheet. A i Y 4. Expansion joint havin%a multiplicity of perforations in its side, wit mastic material exposed thru said perforations.

5. Expansion joint comprising sheets a1- ternating with layers of mastic material, the outside sheets, roviding a surface for the joint, being pe orated and exposing restrictf 'ed ortionsof the mastic la ers.

4o igned at Chicago, Illino1s, this 21st day of July 1926.

= ALBERT or FISCHER. 

